Variable Interest Entities - Nonconsolidated Variable Interest Entities (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Carrying Value of the Firm's Variable Interests in Nonconsolidated VIEs - Assets	$ 1,163,028	$ 992,968
Carrying Value of the Firm's Variable Interests in Nonconsolidated VIEs - Liabilities	1,067,096	902,703
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets in VIE	148,665	128,069
Carrying Value of the Firm's Variable Interests in Nonconsolidated VIEs - Assets	8,624	9,526
Carrying Value of the Firm's Variable Interests in Nonconsolidated VIEs - Liabilities	888	619
Maximum Exposure to Loss in Nonconsolidated VIEs	19,041	20,786
Retained Interests, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	3,182	3,372
Purchased Interests, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	1,041	901
Commitments and Guarantees, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	2,455	2,697
Derivatives, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	8,343	9,010
Debt and equity, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	4,020	4,806
Mortgage-Backed [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets in VIE	99,353	75,354
Carrying Value of the Firm's Variable Interests in Nonconsolidated VIEs - Assets	4,014	3,830
Maximum Exposure to Loss in Nonconsolidated VIEs	4,455	3,946
Mortgage-Backed [Member] \| Retained Interests, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	2,990	3,223
Mortgage-Backed [Member] \| Purchased Interests, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	1,024	607
Mortgage-Backed [Member] \| Commitments and Guarantees, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	47	50
Mortgage-Backed [Member] \| Derivatives, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	394	66
Corporate debt and other asset-backed [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets in VIE	14,077	16,248
Carrying Value of the Firm's Variable Interests in Nonconsolidated VIEs - Assets	913	2,040
Carrying Value of the Firm's Variable Interests in Nonconsolidated VIEs - Liabilities	874	612
Maximum Exposure to Loss in Nonconsolidated VIEs	9,383	11,821
Corporate debt and other asset-backed [Member] \| Retained Interests, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	192	149
Corporate debt and other asset-backed [Member] \| Purchased Interests, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	17	294
Corporate debt and other asset-backed [Member] \| Commitments and Guarantees, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	989	1,374
Corporate debt and other asset-backed [Member] \| Derivatives, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	7,862	8,849
Corporate debt and other asset-backed [Member] \| Debt and equity, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	323	1,155
Real estate, credit- and power-related and other investing [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets in VIE	20,934	19,602
Carrying Value of the Firm's Variable Interests in Nonconsolidated VIEs - Assets	3,288	3,243
Carrying Value of the Firm's Variable Interests in Nonconsolidated VIEs - Liabilities	14	7
Maximum Exposure to Loss in Nonconsolidated VIEs	4,746	4,543
Real estate, credit- and power-related and other investing [Member] \| Commitments and Guarantees, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	1,374	1,213
Real estate, credit- and power-related and other investing [Member] \| Derivatives, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	84	92
Real estate, credit- and power-related and other investing [Member] \| Debt and equity, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	3,288	3,238
Investment In Funds [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets in VIE	14,301	16,865
Carrying Value of the Firm's Variable Interests in Nonconsolidated VIEs - Assets	409	413
Maximum Exposure to Loss in Nonconsolidated VIEs	457	476
Investment In Funds [Member] \| Commitments and Guarantees, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	45	60
Investment In Funds [Member] \| Derivatives, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	3	3
Investment In Funds [Member] \| Debt and equity, Maximum Exposure to Loss [Member] \| Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Nonconsolidated VIEs	$ 409	$ 413

Size of the variable interest entity measured by total assets.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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